Thermal decomposition of ammonia. N2H4-an intermediate reaction product

Dirtu, Daniela; Odochian, Lucia; Pui, Aurel; Humelnicu, Ionel

doi:10.2478/s11532-006-0030-4

Cited by 38 publications

(35 citation statements)

References 11 publications

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“…As compared with the relatively low SI‐DRIFTS spectrum of S‐Pt‐C 3 N 4 under dark conditions, the characteristic peaks were significantly enhanced under light irradiation (Figure C). More specifically, the peak at 821 cm −1 is attributed to the breathing vibration of heptazine rings, and the peak at 1006 cm −1 is indexed to the N−H bending vibration . The broad band at 1200–1700 cm −1 corresponds to the stretching vibration mode of CN heterocycles with peaks positioned at 1697, 1493, and 1341 cm −1 .…”

Section: Figurementioning

confidence: 99%

Direct Observation of Dynamic Bond Evolution in Single‐Atom Pt/C₃N₄ Catalysts

et al. 2020

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Single‐atom catalysts are promising platforms for heterogeneous catalysis, especially for clean energy conversion, storage, and utilization. Although great efforts have been made to examine the bonding and oxidation state of single‐atom catalysts before and/or after catalytic reactions, when information about dynamic evolution is not sufficient, the underlying mechanisms are often overlooked. Herein, we report the direct observation of the charge transfer and bond evolution of a single‐atom Pt/C3N4 catalyst in photocatalytic water splitting by synchronous illumination X‐ray photoelectron spectroscopy. Specifically, under light excitation, we observed Pt−N bond cleavage to form a Pt0 species and the corresponding C=N bond reconstruction; these features could not be detected on the metallic platinum‐decorated C3N4 catalyst. As expected, H2 production activity (14.7 mmol h−1 g−1) was enhanced significantly with the single‐atom Pt/C3N4 catalyst as compared to metallic Pt‐C3N4 (0.74 mmol h−1 g−1).

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Section: Figurementioning

confidence: 99%

Direct Observation of Dynamic Bond Evolution in Single‐Atom Pt/C₃N₄ Catalysts

et al. 2020

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“…Experimental data from [11] performed at 1073 K, 1 atm and in a quartz reactor, showed that after 60 s, 40% of NH 3 is decomposed. However, under the same condition, current simulations predict only a 5% decomposition of NH 3 .…”

Section: Surface Reactionsmentioning

confidence: 99%

Carbonitriding: kinetic modeling of ammonia and acetylene decomposition at high temperature and low pressure

Vyazmina

Sheng

Jallais

et al. 2018

Matériaux & Techniques

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The process of carbonitriding is similar to the process of carburization yet with additional ammonia to increase the hardness of the metal surface. Carbonitriding is performed at approximately 850°C-880°C, which is lower compare to carburizing and low pressure (10-50 mbar). The process consists of two stages: decomposition of ammonia and diffusion of "activated nitrogen", and decomposition of acetylene and diffusion of carbon. The decomposition of acetylene is a very complex phenomenon, depending on the temperature, pressure and residence time (the time of presence of acetylene in a furnace). Different reaction products form: small molecules (H 2 , CH 4 , C 2 H 4 , C 6 H 6 , etc.), fine-crystalline graphite (the one that diffuses into the metal surface), polycyclic aromatic hydrocarbons (PAHs), soot etc. The current investigation is based on detailed kinetic modeling (using Chemkin 17.1) of the acetylene decomposition in the atmosphere of a reactor. For this modeling three different comprehensive mechanisms from the literature are considered: the mechanism of K. Norinaga (including 227 species, 827 reactions), the mechanism of T. Bensabath (including 364 species, 1245 reactions) and the mechanism of C. Saggese (including 350 species, more than 10,000 reactions). Comparison of simulation results with experimental data from the literature showed good agreement, demonstrating their applicability for modeling of industrial process. A parametric study suggests the best parameters for acetylene decomposition in a furnace.

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“…Ge 3 N 4 nanowires were growing on the surface of Ge source, while InP NWs were formed on the Si substrate, located at 2 cm above the source. At elevated temperatures the Ge and InP surfaces served as catalysts and N 2 H 4 was decomposed through the fast chain reactions, forming active transient nitrogen precursors (NH 2 , NH, N) until finally the stabile N 2 , NH 3 and H 2 molecules were formed [13][14][15] . The Mc Bain quartz spiral microbalance was used for the analysis of the interaction of Ge source with hydrazine that was containing different amount of water.…”

Section: Methodsmentioning

confidence: 99%

Influence of Water on the Growth Process of Ge3N4 and InP Nanowires

Jishiashvili¹,

Shiolashvili²,

Makhatadze³

et al. 2017

Orient. J. Chem

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The germanium nitride and InP nanowires were grown using the pyrolytic decomposition products of hydrazine (N 2 H 4 ), which was containing 3 mol.% H 2 O. In a separate set of experiments the quartz microbalance was used to study the interaction of water containing hydrazine with Ge sample in the temperature range of 450-650°C. It was established that up to 500°C only water molecules interact with Ge, forming volatile suboxide GeO. At higher temperatures GeO molecules and nitrogen precursors, produced after decomposition of hydrazine, form crystalline Ge 3 N 4 nanowires on the Ge surface. Analysis of thermo-chemical reactions reveal that in the presence of water molecules and nitrogen precursors the formation of nitride is thermodynamically favourable than the synthesis of germanium dioxide. When InP was annealed in hydrazine at 440°C the water molecules were producing volatile In 2 O. After reaching the Si substrate these molecules were interacting with phosphorus vapor, producing InP nanowires.

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Thermal decomposition of ammonia. N2H4-an intermediate reaction product

Cited by 38 publications

References 11 publications

Direct Observation of Dynamic Bond Evolution in Single‐Atom Pt/C₃N₄ Catalysts

Direct Observation of Dynamic Bond Evolution in Single‐Atom Pt/C₃N₄ Catalysts

Carbonitriding: kinetic modeling of ammonia and acetylene decomposition at high temperature and low pressure

Influence of Water on the Growth Process of Ge3N4 and InP Nanowires

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Thermal decomposition of ammonia. N2H4-an intermediate reaction product

Cited by 38 publications

References 11 publications

Direct Observation of Dynamic Bond Evolution in Single‐Atom Pt/C3N4 Catalysts

Direct Observation of Dynamic Bond Evolution in Single‐Atom Pt/C3N4 Catalysts

Carbonitriding: kinetic modeling of ammonia and acetylene decomposition at high temperature and low pressure

Influence of Water on the Growth Process of Ge3N4 and InP Nanowires

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Direct Observation of Dynamic Bond Evolution in Single‐Atom Pt/C₃N₄ Catalysts

Direct Observation of Dynamic Bond Evolution in Single‐Atom Pt/C₃N₄ Catalysts